Idea from http://montreal.pm.org/tech/neil_kandalgaonkar.shtml. Notice that the number cannot be too big.
-
-
Save tsaniel/1098962 to your computer and use it in GitHub Desktop.
isPrimeNumber (using RegExp)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function( | |
a // the number | |
){ | |
return !/^,?$|^(,,+)\1+$/.test( | |
Array( // repeat the string ',' | |
-~a // coerce to integer | |
) | |
) | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function(a){return!/^,?$|^(,,+)\1+$/.test(Array(-~a))} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
Version 2, December 2004 | |
Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE> | |
Everyone is permitted to copy and distribute verbatim or modified | |
copies of this license document, and changing it is allowed as long | |
as the name is changed. | |
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
0. You just DO WHAT THE FUCK YOU WANT TO. |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
{ | |
"name": "isPrimeNumber", | |
"description": "Check if a number is prime with RegExp", | |
"keywords": [ | |
"isPrimeNumber", | |
"RegExp", | |
"Prime" | |
] | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!DOCTYPE html> | |
<title>isPrimeNumber</title> | |
<div>Expected value: <b>true</b></div> | |
<div>Actual value: <b id="ret"></b></div> | |
<script> | |
var myFunction = function(a){return!/^,?$|^(,,+)\1+$/.test(Array(-~a))}; | |
document.getElementById( "ret" ).innerHTML = myFunction(541) | |
</script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
I'd like to see a prove for that.
OK, guys. stop wasting your time now and get sane. An End to Negativity!